Direct Torque Control Of Induction Motor Drive

Muhd Zharif Rifqi, Zuber Ahmadi (2012) Direct Torque Control Of Induction Motor Drive. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Direct torque control (DTC) has gained popularity for induction motor control that requires high torque control performance due to its simplicity. This scheme does not require a frame transformer, knowledge of machine parameters, speed sensor and current controller, as opposed to the Field Oriented Control (FOC) which is another control scheme of induction machine. The prototype DTC drive offers several advantages such as robust control (less sensitivity to parameter variations), speed sensorless drive, inherent current control, fast instantaneous torque and flux controL The DTC algorithm (including estimations of flux and torque, hysteresis controllers, look-up table and etc) was performed using a low-cost Digital Signal Processor (DSP) controller board, i.e. eZdsp F28335. The algorithm of DTC was developed using IQ Math-MATLAB components as provided by Texas Instrument to optimize and minimize the digital computation in DSP. A decoupled control of torque and flux that provides fast dynamic control can be established in DTC, where in torque and flux are controlled using 3-level and 2-level hysteresis comparators, respectively. The output of comparators and flux sector information are used to index the look-up table, to select appropriate voltage vectors to control torque and flux, simultaneously. By modelling the DTC algorithm using IQ-math components, the sampling period of DSP computation can be minimized at 50 JL s, that is much smaller than that obtained using Simulink component (about 100 J-L s). The feasibility and effectiveness of DTC implementation using ezDSP F28335 to provide fast instantaneous torque and flux control were verified through experimental results.

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